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<li class="chapter"> <a href="http-ngx_http_core_module.html" title="ngx_http_core_module"> ngx_http_core_module </a> </li>
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<li class="chapter"> <a href="http-ngx_http_charset_module.html" title="ngx_http_charset_module"> ngx_http_charset_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_dav_module.html" title="ngx_http_dav_module"> ngx_http_dav_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_empty_gif_module.html" title="ngx_http_empty_gif_module"> ngx_http_empty_gif_module </a> </li>
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<li class="chapter"> <a href="http-ngx_http_fastcgi_module.html" title="ngx_http_fastcgi_module"> ngx_http_fastcgi_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_flv_module.html" title="ngx_http_flv_module"> ngx_http_flv_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_geo_module.html" title="ngx_http_geo_module"> ngx_http_geo_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_geoip_module.html" title="ngx_http_geoip_module"> ngx_http_geoip_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_grpc_module.html" title="ngx_http_grpc_module"> ngx_http_grpc_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_gunzip_module.html" title="ngx_http_gunzip_module"> ngx_http_gunzip_module </a> </li>
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<li class="chapter"> <a href="http-ngx_http_gzip_static_module.html" title="ngx_http_gzip_static_module"> ngx_http_gzip_static_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_headers_module.html" title="ngx_http_headers_module"> ngx_http_headers_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_hls_module.html" title="ngx_http_hls_module"> ngx_http_hls_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_image_filter_module.html" title="ngx_http_image_filter_module"> ngx_http_image_filter_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_index_module.html" title="ngx_http_index_module"> ngx_http_index_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_js_module.html" title="ngx_http_js_module"> ngx_http_js_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_keyval_module.html" title="ngx_http_keyval_module"> ngx_http_keyval_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_limit_conn_module.html" title="ngx_http_limit_conn_module"> ngx_http_limit_conn_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_limit_req_module.html" title="ngx_http_limit_req_module"> ngx_http_limit_req_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_log_module.html" title="ngx_http_log_module"> ngx_http_log_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_map_module.html" title="ngx_http_map_module"> ngx_http_map_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_memcached_module.html" title="ngx_http_memcached_module"> ngx_http_memcached_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_mirror_module.html" title="ngx_http_mirror_module"> ngx_http_mirror_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_mp4_module.html" title="ngx_http_mp4_module"> ngx_http_mp4_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_perl_module.html" title="ngx_http_perl_module"> ngx_http_perl_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_proxy_module.html" title="ngx_http_proxy_module"> ngx_http_proxy_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_random_index_module.html" title="ngx_http_random_index_module"> ngx_http_random_index_module </a> </li>
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<li class="chapter"> <a href="http-ngx_http_slice_module.html" title="ngx_http_slice_module"> ngx_http_slice_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_spdy_module.html" title="ngx_http_spdy_module"> ngx_http_spdy_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_split_clients_module.html" title="ngx_http_split_clients_module"> ngx_http_split_clients_module </a> </li>
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<li class="chapter"> <a href="http-ngx_http_upstream_conf_module.html" title="ngx_http_upstream_conf_module"> ngx_http_upstream_conf_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_upstream_hc_module.html" title="ngx_http_upstream_hc_module"> ngx_http_upstream_hc_module </a> </li>
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<li class="chapter"> <a href="http-ngx_http_uwsgi_module.html" title="ngx_http_uwsgi_module"> ngx_http_uwsgi_module </a> </li>
<li class="chapter"> <a href="" title="ngx_http_v2_module"> ngx_http_v2_module </a> </li>
<li class="chapter"> <a href="http-ngx_http_xslt_module.html" title="ngx_http_xslt_module"> ngx_http_xslt_module </a> </li>
<li class="chapter"> <a href="mail-ngx_mail_core_module.html" title="ngx_mail_core_module"> ngx_mail_core_module </a> </li>
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<li class="chapter"> <a href="stream-ngx_stream_core_module.html" title="ngx_stream_core_module"> ngx_stream_core_module </a> </li>
<li class="chapter"> <a href="stream-ngx_stream_access_module.html" title="ngx_stream_access_module"> ngx_stream_access_module </a> </li>
<li class="chapter"> <a href="stream-ngx_stream_geo_module.html" title="ngx_stream_geo_module"> ngx_stream_geo_module </a> </li>
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<li class="chapter"> <a href="stream-ngx_stream_return_module.html" title="ngx_stream_return_module"> ngx_stream_return_module </a> </li>
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<li class="chapter"> <a href="stream-ngx_stream_ssl_preread_module.html" title="ngx_stream_ssl_preread_module"> ngx_stream_ssl_preread_module </a> </li>
<li class="chapter"> <a href="stream-ngx_stream_upstream_module.html" title="ngx_stream_upstream_module"> ngx_stream_upstream_module </a> </li>
<li class="chapter"> <a href="stream-ngx_stream_upstream_hc_module.html" title="ngx_stream_upstream_hc_module"> ngx_stream_upstream_hc_module </a> </li>
<li class="chapter"> <a href="stream-ngx_stream_zone_sync_module.html" title="ngx_stream_zone_sync_module"> ngx_stream_zone_sync_module </a> </li>
<li class="chapter"> <a href="ngx_google_perftools_module.html" title="ngx_google_perftools_module"> ngx_google_perftools_module </a> </li>
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<h1>Module ngx_http_v2_module</h1>
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<div><ul>
<li><a href="#issues">Known Issues</a></li>
<li><a href="#example">Example Configuration</a></li>
<li><a href="#directives">Directives</a>
<ul>
<li><a href="#http2_body_preread_size">http2_body_preread_size</a></li>
<li><a href="#http2_chunk_size">http2_chunk_size</a></li>
<li><a href="#http2_idle_timeout">http2_idle_timeout</a></li>
<li><a href="#http2_max_concurrent_pushes">http2_max_concurrent_pushes</a></li>
<li><a href="#http2_max_concurrent_streams">http2_max_concurrent_streams</a></li>
<li><a href="#http2_max_field_size">http2_max_field_size</a></li>
<li><a href="#http2_max_header_size">http2_max_header_size</a></li>
<li><a href="#http2_max_requests">http2_max_requests</a></li>
<li><a href="#http2_push">http2_push</a></li>
<li><a href="#http2_push_preload">http2_push_preload</a></li>
<li><a href="#http2_recv_buffer_size">http2_recv_buffer_size</a></li>
<li><a href="#http2_recv_timeout">http2_recv_timeout</a></li>
</ul>
</li>
<li><a href="#variables">Embedded Variables</a><br><a href="" id="summary"></a></li>
</ul>
<p><code>ngx_http_v2_module</code>模块(1.9.5)提供对<a href="javascript:window.open('https://tools.ietf.org/html/rfc7540');" target="_blank" rel="noopener noreferrer">HTTP/2</a>的支持，并取代<a href="http-ngx_http_spdy_module.html">ngx_http_spdy_module</a>模块。</p>
<p>默认情况下未构建此模块，应使用<code>--with-http_v2_module</code>配置参数启用它。</p>
<p><a href="" id="issues"></a></p>
<h4 id="known-issues"><a href="#known-issues" id="known-issues"></a>Known Issues</h4>
<p>在 1.9.14 版之前，无论<a href="http-ngx_http_proxy_module.html#proxy_request_buffering">proxy_request_buffering</a>，<a href="http-ngx_http_fastcgi_module.html#fastcgi_request_buffering">fastcgi_request_buffering</a>，<a href="http-ngx_http_uwsgi_module.html#uwsgi_request_buffering">uwsgi_request_buffering</a>和<a href="http-ngx_http_scgi_module.html#scgi_request_buffering">scgi_request_buffering</a>指令值如何，都不能禁用客户端请求正文的缓冲。</p>
<p>在 1.19.1 版之前，没有使用<a href="http-ngx_http_core_module.html#lingering_close">lingering_close</a>机制来控制关闭 HTTP/2 连接。</p>
<p><a href="" id="example"></a></p>
<h4 id="example-configuration"><a href="#example-configuration" id="example-configuration"></a>Example Configuration</h4>
<pre><code class="hljs language-shell">server {
    listen 443 ssl http2;

    ssl_certificate server.crt;
    ssl_certificate_key server.key;
}
</code></pre>
<p>请注意，通过 TLS 接受 HTTP/2 连接需要“应用程序层协议协商”(ALPN)TLS 扩展支持，该支持仅从<a href="javascript:window.open('https://www.openssl.org/');" target="_blank" rel="noopener noreferrer">OpenSSL</a>版本 1.0.2 起可用。为此，不能保证使用“下一协议协商”(NPN)TLS 扩展(自 OpenSSL 版本 1.0.1 起可用)。</p>
<p>另请注意，如果<a href="http-ngx_http_ssl_module.html#ssl_prefer_server_ciphers">ssl_prefer_server_ciphers</a>指令设置为值“ <code>on</code>”，则应将<a href="http-ngx_http_ssl_module.html#ssl_ciphers">ciphers</a>配置为符合<a href="javascript:window.open('https://tools.ietf.org/html/rfc7540#appendix-A');" target="_blank" rel="noopener noreferrer">RFC 7540，附录 A</a>黑名单并受客户端支持。</p>
<p><a href="" id="directives"></a></p>
<h4 id="directives"><a href="#directives" id="directives"></a>Directives</h4>
<p><a href="" id="http2_body_preread_size"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_body_preread_size size;</code></td></tr>
<tr><td>Default:</td><td><code>http2_body_preread_size 64k;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>该指令出现在 1.11.0 版本中。</p>
<p>为每个请求设置缓冲区的<code>size</code>，在开始处理请求之前可以在其中保存请求主体。</p>
<p><a href="" id="http2_chunk_size"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_chunk_size size;</code></td></tr>
<tr><td>Default:</td><td><code>http2_chunk_size 8k;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code> , <code>location</code></td></tr>
</tbody>
</table>
<p>设置将响应主体切成的块的最大大小。太低的值会导致更高的开销。值过高会损害<a href="javascript:window.open('https://en.wikipedia.org/wiki/Head-of-line_blocking');" target="_blank" rel="noopener noreferrer">HOL blocking</a>的优先级。</p>
<p><a href="" id="http2_idle_timeout"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_idle_timeout time;</code></td></tr>
<tr><td>Default:</td><td><code>http2_idle_timeout 3m;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>设置不活动的超时，然后关闭连接。</p>
<p><a href="" id="http2_max_concurrent_pushes"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_max_concurrent_pushes number;</code></td></tr>
<tr><td>Default:</td><td><code>http2_max_concurrent_pushes 10;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>该指令出现在版本 1.13.9 中。</p>
<p>限制 Connecting 并发<a href="#http2_push">push</a>请求的最大数量。</p>
<p><a href="" id="http2_max_concurrent_streams"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_max_concurrent_streams number;</code></td></tr>
<tr><td>Default:</td><td><code>http2_max_concurrent_streams 128;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>设置 Connecting 并发 HTTP/2 流的最大数量。</p>
<p><a href="" id="http2_max_field_size"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_max_field_size size;</code></td></tr>
<tr><td>Default:</td><td><code>http2_max_field_size 4k;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>限制<a href="javascript:window.open('https://tools.ietf.org/html/rfc7541');" target="_blank" rel="noopener noreferrer">HPACK</a>压缩的请求 Headers 字段的最大大小。该限制对名称和值均适用。请注意，如果应用霍夫曼编码，则解压缩后的名称和值字符串的实际大小可能会更大。对于大多数请求，默认限制应该足够。</p>
<p><a href="" id="http2_max_header_size"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_max_header_size size;</code></td></tr>
<tr><td>Default:</td><td><code>http2_max_header_size 16k;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>限制<a href="javascript:window.open('https://tools.ietf.org/html/rfc7541');" target="_blank" rel="noopener noreferrer">HPACK</a>解压缩后整个请求 Headers 列表的最大大小。对于大多数请求，默认限制应该足够。</p>
<p><a href="" id="http2_max_requests"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_max_requests number;</code></td></tr>
<tr><td>Default:</td><td><code>http2_max_requests 1000;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>该指令出现在 1.11.6 版本中。</p>
<p>设置可以通过一个 HTTP/2 连接提供服务的最大请求数量(包括<a href="#http2_push">push</a>个请求)，此后下一个客户端请求将导致连接关闭以及需要构建新连接。</p>
<p>要释放每个连接的内存分配，必须定期关闭连接。因此，使用过多的最大请求数可能会导致过多的内存使用，因此不建议这样做。</p>
<p><a href="" id="http2_push"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_push uri | off;</code></td></tr>
<tr><td>Default:</td><td><code>http2_push off;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code> , <code>location</code></td></tr>
</tbody>
</table>
<p>该指令出现在版本 1.13.9 中。</p>
<p>抢先向指定的<code>uri</code>发送(<a href="javascript:window.open('https://tools.ietf.org/html/rfc7540#section-8.2');" target="_blank" rel="noopener noreferrer">pushes</a>)请求以及对原始请求的响应。仅处理具有绝对路径的相对 URI，例如：</p>
<pre><code class="hljs language-shell">http2_push /static/css/main.css;
</code></pre>
<p><code>uri</code>值可以包含变量。</p>
<p>可以在同一配置级别上指定多个<code>http2_push</code>指令。 <code>off</code>参数取消了从先前配置级别继承的<code>http2_push</code>指令的效果。</p>
<p><a href="" id="http2_push_preload"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_push_preload on | off;</code></td></tr>
<tr><td>Default:</td><td><code>http2_push_preload off;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code> , <code>location</code></td></tr>
</tbody>
</table>
<p>该指令出现在版本 1.13.9 中。</p>
<p>启用将“链接”响应标题字段中指定的<a href="javascript:window.open('https://www.w3.org/TR/preload/#server-push-http-2');" target="_blank" rel="noopener noreferrer">preload links</a>自动转换为<a href="javascript:window.open('https://tools.ietf.org/html/rfc7540#section-8.2');" target="_blank" rel="noopener noreferrer">push</a>请求的功能。</p>
<p><a href="" id="http2_recv_buffer_size"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_recv_buffer_size size;</code></td></tr>
<tr><td>Default:</td><td><code>http2_recv_buffer_size 256k;</code></td></tr>
<tr><td>Context:</td><td><code>http</code></td></tr>
</tbody>
</table>
<p>设置每个<a href="ngx_core_module.html#worker_processes">worker</a>输入缓冲区的大小。</p>
<p><a href="" id="http2_recv_timeout"></a></p>
<table>
<thead></thead>
<tbody>
<tr><td>Syntax:</td><td><code>http2_recv_timeout time;</code></td></tr>
<tr><td>Default:</td><td><code>http2_recv_timeout 30s;</code></td></tr>
<tr><td>Context:</td><td><code>http</code> , <code>server</code></td></tr>
</tbody>
</table>
<p>设置超时，以期从客户端获取更多数据，然后关闭连接。</p>
<p><a href="" id="variables"></a></p>
<h4 id="embedded-variables"><a href="#embedded-variables" id="embedded-variables"></a>Embedded Variables</h4>
<p><code>ngx_http_v2_module</code>模块支持以下嵌入式变量：</p>
<h4 id="http2"><a href="#var_http2" id="var_http2"></a> $http2</h4>
<ul>
<li>协商的协议标识符：“ <code>h2</code>”表示 TLS 上的 HTTP/2，“ <code>h2c</code>”表示基于明文 TCP 的 HTTP/2，否则为空字符串。</li>
</ul>
</div>
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